| |
| | 7 |
 | | Extension occurs during continental rifting (e.g., Rhine Graben, North Sea Basin, Basin and Range, Red Sea, East African Rift Valley), at mid-ocean ridge spreading centres, within passive continental margins (e.g., Gulf Coast) and during extensional collapse of orogenic belts (e.g., Variscan). |
 | | Horsts are relatively uplifted and unrotated blocks bound by outward dipping normal faults; Graben are relatively down-dropped and unrotated blocks bound by inward dipping normal faults. |
 | | Growth Faults: Because extension and normal faulting are intimately associated with the formation of sedimentary basins, sedimentation and fault displacements often occur simultaneously. |
| www4.geology.utoronto.ca /glg345/GLG345_L11.htm (805 words) |
|